Feed-mill.



No. 674,599. Patented may 2|, |901.

N. BURR.

FEED MILL.

(Applcation'led Apr. 5, 1899.)

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UNITED STATES n lPATENT f PRICE.

NELSON BURR, OF BATAVIA, ILLINOIS, ASSIGNOR TO THE SPARTAN MANUFACTURING COMPANY, OF ILLINOIS.

FEED-Mlm..

SPECIFICATION forming part of Letters Patent No. 674,599, dated May 21, 1901.

Application filed April 5, 1899. Serial No. 711,884:- (No model.) I

To all wir/0m. it may concern:

Be it known that I, NELSON BURR, a citizen of the United States, and a resident of Batavia, county of Kane, and State of Illinois, have invented certain new and useful 1mprovements in Feed-Mills, of which the following is a specification, and which are illustrated in the accompanying drawings, forming a part thereof.

This invention relates particular ly to mills for grinding corn and to such as are adapted to reduce both the kernel and the cob. Its object is to provide for the reduction of the cob and corn with the least possible expenditure ofpowerand simultaneously; and this object is attained inthe construction hereinafter fully described, and which are illustrated in the accompanying drawings, in which- Figure l is a plan section on the broken line l l of Fig. 2. Fig. 2 is a detail vertical section on/the line 2 2 of Fig. l. Fig. 3 is a detail plan of the grinding-rings. Fig. 4 is a detail elevation of the grinding-face of the Fig. 5 is a detail elevation of the grinding-face of the inner or movable ring. Fig. 6 is adetail elevation of the inner wall of the reducing-chamber. Fig. 7 is a detail section on the line 7 7 of Fig. 6. Fig. 8 is a detail elevation of the reducing-head, and Fig. 9 is a detail section on the line 9 9 of Fig. 8.

Mills of this character are usually so constructed that the cob is broken up into fragments before reaching the abrading or grinding faces. This breaking of the cobs requires the expenditure of great force, especially as the material is apt to become wedged in the mill. Another disadvantage of mills as usually constructed is that the corn is largely shelled before the material reaches the grinding-faces, and as the cob is lighter than the kernel it is apt to float upwardly and accumulate above the ears as they are fed into the hopper, so as to necessitate their removal. Another difficulty arises from the fact that ears are not infrequently thrown into the mill with all or a portion of the husk remaining attached thereto, and as a result the mill is apt to become clogged. These several difficulties are overcome by -so constructing the reducing-chamber that the corn is not acted upon until it is in close proximity tothe grinding-rings. There is comparatively little agitation of the contents of the hopper; but as the ears approach the grinding-rings they are guided into a position approximately parallel with the axis of the reducing-head and are cut transversely by blades attached thereto, which are so formed that they also serve as feeding devices for forcing the material downwardly into the grinding-rings, the blades upon the walls of the reducing-chamber coperating vwith the blades of the head to accomplish this feed. The grinding-rings are provided with teeth having upstanding cutters, which seize and draw downwardly the material as it is delivered by the feed mechanism above referred to, these cutters being of great value in reducing the husks which may be fed into the mill with the ears.

The mill is provided with a standard A of any suitable construction, upon which is superimposed an upper case B, which carries a hopper O and incloses the reducing-chamber and the reducing-head D. The inner ringE is bolted to the head D, so as to rotate with it, and the outer grinding-ring F is fixed Within the case B. Power is applied to the mill by any suitable mechanism, as shown by means of a sweep G, fixed. to a ring g, located between the standard A and the upper frame B and being in the form of an internal gear and in mesh with a plurality of gears H, which intermesh with a pinion h, fixed upon the shaft K, which carries the reducing-head D and is journaled in a suitable boX la', carried by the frame B, the shaft K being stepped in a vertically-adjustable bridge O, as shown at 7o, pivotally secured to the frame A at o and being provided at its movable end With a screwbolt O', which projects upwardly through a portion of the frame B and is provided with an adjusting-nut o. By means of the bridge the grinding-rings may be adjusted.

Within suitable dovetailed channels in the inner face of the wall IWI of the reducing-chamber are placed a plurality of segmental plates m, each bearing upon its inner face guideribs, such as m m2 mi. These ribs are oblique loo to the axis of the reducing-head, the inclination from above downwardly being in the direction of the rotation of the head.

Within suitable dovetailed recesses in the peripheral wall of the reducing-head D are located a plurality of segmental plates CZ, each being provided with reducing-blades cl,of any desired number. The blades d' are radial as to the axis of the head D, and their advancing edges are ground to form cutting-blades, their lower faces being inclined downwardly and backwardly, so as to secure a wedge action upon the feed to force it downwardly. Dierently described, the blades d' are each provided with a cutting edge, located in the plane of rot-ation, and a lower beveled face. The rotating grinding-,ring E is provided with major cutting-ribs @and minor ribs e c2. The ribs e extend entirely across the face of the ring and project above it as prongs, their advancing faces being concave, as plainly shown in Figs. 3 and 5. The minor ribs c' e2 are located near the base of the ring, and the interspaces between the ribs decrease in depth toward their lower ends. The grinding-face of the outer (the stationary) ring F is substantially the complement of the face ofthe grinding-ring E, having majorcutting-ribsf, which project upwardly as prongs, and minor cutting-ribs f' at its base.

A scraping-shoe P is secured to the grinding-ring E, so as to sweep the chamber into which the meal is discharged from the rings and carry it to the discharge-spout Q. The bolts S, which secure the upper frame B to the standard A, are provided with sleeves s, which rest upon the top of the standard A and support the frame B, and these sleeves also serve as the arbors for the gear-wheels H.

The pitch ofthe wall of the reducing-chamber and of the wall of the reducing-head is such that ears of corn settling down through the hopper C are not attacked by the reducing-blades until they are in close proximity to the grinding-rings, and `meantime the ribs lm have tended to bring theears into approximately vertical position, so that the reducingblades d cut across them. The kernels are mostly separated from the cob in this process of reduction; but the material is all held in firm grip between the reducing-blades d' and the oblique ribs on the walls of the reducingchamber and forced downwardly into the teeth of the grinding-rings. Any husks which may-have entered the mill with the corn are shredded by the upstanding prongs of the ribs ef, so that all of the material is finely reduced as it issues from these rings. The

reducing-head D is dome-shaped, so that it `does not materially agitate the ears as they descend from the hopper, one' of the prime features of the mill being that useless friction between the rotating parts of the mill and the material is avoided.

It will be seen that the plates d taper toward their upper ends and enter the dovetail recesses, into which they t, from below, so that when the parts are inplace the lower edges of these plates rest upon the ring E, and the strain upon them due to the feeding function of the blades d' simply forces the plates more firmly to their seat. Both sets of plates d and m are removable, so that the blades carried thereby may be reground.

l. ln a feed-mill, in combination, a shell, as M, a rotatable reducing-head within the shell, radial blades carried by the head and having their cutting edges in the plane of rotation and their lower faces inclined downwardly and backwardly, concentric grindingrings having upstanding pointed prongs, the outer ring beirff fixed to the shell and the inner ring being ibtatable.

2. In a feed-mill, in combination, a pair of concentric grinding-rings each having major and minor transverse ribs, the major ribs projecting upwardly as prongs, and being pointed.

3. in a feed-mill, in combination, a downwardly-tapering shell having substantially vertical instanding guide-ribs; an upwardlytapering dome-shaped grinding-head having its top rounded; and cutting-blades projecting from the sides of the head and having their edges in the plane of rotation; whereby ear-corn may be delivered to the grindingchamber in quantities, the ears being guided vertically to the blades and the mass being free from material agitation.

4. In a feed-mill, in combination, a downwardly-tapering shell having substantially Vertical instanding guide-ribs; an upwardlytapering dome-shaped grinding-head having its top rounded; and cutting-blades projecting from the sides of the head and having their edges in the plane of rotation and their under faces inclined downwardly and backwardly; whereby ear-corn may be delivered to the grinding-chamber in quantities, the ears being guided vertically to the blades and the mass being free from material agitation.

NELSON BURR.

Witnesses:

LOUIS K. GILLsoN, HEsTER B. BAIRD.

IOO 

